Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 430 DISEASES OF CULTIVATED PLANTS Die back of willow shoots {Diplodina salicina, Cke. and Mass.) attacks the tips of willow shoots and causes them to die back for a distance of six inches or more. The shoots become brown and the scales of the buds are indurated. The fungus bursts through the bark at numerous points, form- FiG. 133.—Ascochytaaspidistrac. i, on portion of a leaf liirida ; 2, perithecia of the fungus bursting through the e|3iderniis of the leaf, ma

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Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 430 DISEASES OF CULTIVATED PLANTS Die back of willow shoots {Diplodina salicina, Cke. and Mass.) attacks the tips of willow shoots and causes them to die back for a distance of six inches or more. The shoots become brown and the scales of the buds are indurated. The fungus bursts through the bark at numerous points, form- FiG. 133.—Ascochytaaspidistrac. i, on portion of a leaf liirida ; 2, perithecia of the fungus bursting through the e|3iderniis of the leaf, mag; 3, section of a peritheciuni, mag ; 4, spores, higlily mag. ing minute cavities with a raised border. The conidia are very numerous, hyaline, elliptic-oblong, i-septate, smooth, 18-24x5-7 /x. Diseased portions should be removed and burned. ASCOCHYTA () Perithecia minute, generally immersed in the substance of bleached spots on leaves or twigs, with a terminal pore; i-septate, hyaline.

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